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<blockquote data-quote="Paul Johnson" data-source="post: 215670" data-attributes="member: 2643"><p>What always concerns me is my inability to assess what comes out of subs. With 50-20K, &#039;quality&#039; and tone are quite obvious and unwanted amp artefacts can be heard, but only recently have I discovered I really have trouble trying to do this with what comes out of a sub, only fed with the bits at the bottom. I&#039;m not sure I can hear things well enough to even determine if its the amp, speakers or anything? With a dodgy sub, it sounds normal until it suddenly makes the new noise denoting a speaker in distress. Up to that point it MUST be changing - something you&#039;d hear higher up - the roughness or the onset of distortion, but in a speaker that only shifts wind for a lot of the time, what does a poor damping factor actually sound like. I found with a signal generator and tones - I could see things that I couldn&#039;t hear. It&#039;s taken me years to realise I simply don&#039;t have the ability to detect problems with LF in any meaningful way. A scope can detect overshoot and make some sense, but I very often cannot hear what it is seeing?</p></blockquote><p></p>

[QUOTE="Paul Johnson, post: 215670, member: 2643"] What always concerns me is my inability to assess what comes out of subs. With 50-20K, 'quality' and tone are quite obvious and unwanted amp artefacts can be heard, but only recently have I discovered I really have trouble trying to do this with what comes out of a sub, only fed with the bits at the bottom. I'm not sure I can hear things well enough to even determine if its the amp, speakers or anything? With a dodgy sub, it sounds normal until it suddenly makes the new noise denoting a speaker in distress. Up to that point it MUST be changing - something you'd hear higher up - the roughness or the onset of distortion, but in a speaker that only shifts wind for a lot of the time, what does a poor damping factor actually sound like. I found with a signal generator and tones - I could see things that I couldn't hear. It's taken me years to realise I simply don't have the ability to detect problems with LF in any meaningful way. A scope can detect overshoot and make some sense, but I very often cannot hear what it is seeing? [/QUOTE]

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